A guide to Scroll-driven Animations with just CSS
Briefly

CSS animations have advanced significantly since Apple introduced them in 2007. Originally simple, they now create intricate effects that can respond to user interactions like scrolling. Traditionally reliant on JavaScript for such animations, recent browser support enables developers to employ CSS-only solutions, minimizing complexity. Key components of scroll-driven animations include the target (the element being animated), keyframes (the defined states during the animation), and the timeline, which governs the sequence of the animation as the user scrolls. Combining these elements effectively can produce captivating visual effects without extensive coding.
An exciting new development in CSS animations is the ability to create scroll-driven effects with minimal code, enhancing user interactions without heavy JavaScript.
Scroll-driven animations consist of three components: the target, the keyframes, and the timeline, where the latter controls the flow of the animation based on user scrolling.
Read at WebKit
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